Osmium-Catalyzed Dihydroxylation of Olefins in Acidic Media: Old Process, New Tricks
作者:Philippe Dupau、Robert Epple、Allen??A. Thomas、Valery??V. Fokin、K.??Barry Sharpless
DOI:10.1002/1615-4169(200206)344:3/4<421::aid-adsc421>3.0.co;2-f
日期:2002.6
osmium-catalyzed dihydroxylation has uncovered that electron-deficient olefins are converted into the corresponding diols much more efficiently when the pH of the reaction medium is maintained on the acidic side. Further studies have identified citric acid as the additive of choice, for it allows preparation of very pure diols in yields generally exceeding 90%. As described here, a much wider range of olefin classes
对锇催化的二羟基化中 500 多种不同功能化添加剂的筛选发现,当反应介质的 pH 值保持在酸性时,缺电子烯烃转化为相应二醇的效率更高。进一步的研究已将柠檬酸确定为首选添加剂,因为它可以制备非常纯的二醇,产率通常超过 90%。正如这里所描述的,现在可以成功地对更广泛的烯烃类别进行二羟基化。该过程在实验上很简单,在大多数情况下,只需将反应物溶解在水或水/叔丁醇混合物中,搅拌它们,然后过滤出纯二醇产物。